People who own the Empeg are big time audiophiles and tend to have hundreds of CDs, so filling them - especially with a high bitrate - is easy. I'm nowhere near filling my 60GB (I'm only at 14) but at least the space is there if I need it.

As for downgrading, yes you can do that in the same way you would replace any drive on the Empeg. I'd check ebay's completed items search for the current drive prices.

Edit: If 10GB is too small, give your Empeg to me and I'll swap you a CD Changer for it